Tumbler lock



Oct. 11 1927.

E. N. JAcoBl TUMBLER LOCK original Filed Dec. 23, 1925 INVENTOR.

A TTORNE Y.

WITNSSES Patented Oct. ll', 11.927. i

UNITED STATES yPATENT" o FFICE.

EDWARD N'. JACOBI, OF MILWAUKEE, WIS

CONSIN, ASSIGNOR TO BRIGGS & STRATTON CORPORATION, OF` MILWAUKEE, `W'ISCONSIN, A CORPORATION OF`DELAWARE.

Original application led December 23, 19215, Serial No. 77,295. Divided and 14, 1927. Serial No. 175,344.

This invention has for its object to provide atumbler lock inl which the lock barrel enters thelock-case from t-he front and is confined in place by meansA of a metal cap turning therewith and having a sealing engagement.. with the lock-case that will eifectually prevent tampering with the lock barrel. A

Another object of the invention is to provide such a sealing cap of soft steel so as 'torender it of greater protection against dama e. j

gAnother object of the invention is to simplify the construction of locks of this character so as to render them inexpensive to manufacture and at the same time ditlicult-` to damage in such'a way as to obtain the use of the parts locked thereby. i

This oase forms a division of my application for tumbler locks, Serial No. 77,295,

filed December 23, 1925.'

With the above and other objectsin view the invention consists in the lock as herein claimed, its parts and combinations of parts and all' equivalents. l

` Referring to the accompanying drawings, in which'like characters of reference indicate similar parts in diii'e'rent views,

Fig. l isa central sectionaljview of a lock constructed Y in accordance with this invention;

Fig. 2 is a tioned; l

Fig. 3 is a perspective longitudinal sectional view of the lock-case thereof, and

Fig. 4 is a cap thereof.

In these drawings, 15 drcal lock-case in which is planrview thereof partly secindicates a cylinmounted to rotate or oscillate a look barrel 16 having a longitudinal key slot 17 to receive a key 18 and provided with ktransversely extending slide tumblers 19 adapted to engage grooves 2O 1 n the walls of the lock-case when the key 1s removed but fitting the variously lengthed bits of the key so as to be withdrawn thereby when the key is inserted to lie flush with the surface fof the lock barrel and permit the lock barrel to be turned by means of the key. This lock barrel 16 is let into the lock-case from the front thereof. The annular groove 22 formed in the bore of, the lock-case near the lower end thereof is to permit the longitudinal grooves 20 to be broached therein.

perspective view of the sealing.

The lock barrel 16 may be made of a die castlng as a convenient and inexpensive construction for obtaining uniformity and, as the alloy metal of such die castings is not suitable for withstanding attempts at mutilat-ion for access to or unauthorized use of the parts looked, a protecting sealing cap 23 is used, preferably of soft steel, as better resisting intentional damagethan the harder metal. This cap is provided with a recess to fit over the upper end of the lock barrel and have a tight forced fit therewith so as to turn with the lock barrel. The sealing cap'. 23 is provided with a key-hole 25 registering with the key slot 17 of the lock barrel.

The lock-case l5 is provided with an annular flange 33 in its counterbore interrupted y the same broaching operation that produces the tumbler grooves 20 and the sealing cap 23 fits within this flange and bears thereon, its lower end, however, being cut away to leaveA only the opposite pair of downwardly and outwardly extendin hooklike locking lugs 34, as shown in ig. 4, which may be entered through the slots 20 and then turned into locking engagement with the flange 33. The lock barrel 16 is also enter through the into engagement beneath the'flange 33, the

also provided with a pair of oppositely posilocking lugs 35, which may7 slot 2O and then turn tioned projecting spacing of the flange 33 from the shoulder 36 formed between the bore and the counterbore of the lock-case providing an annular groove 37' to receive said locking lugs 34 and 35.

The sealing cap 23 has a .forced lit on the end of the lock barrel 16', these parts' being lforced together during the assembly. It also has' anh annular ange or shoulder at its upper end with a working t in the counterbore of the lock-case overlying flange 33 to protect it from injury and to conceal the slots 20. The lock barrel is entered in the lock-case, its locking lugs 35 passing through the slots 20 and then being turned into groove 37 to clear the slots 20 for the rethis application filed March ception of the locking lugs 34 of the cap. i

Aunlocking position of the lock. When the key is then turned to thelocking osition of where the lugs 35 of the lock barrel register assumed b the sealing ca with the slots 20.

It will be seen that both the lugs 35 of the lock barrel and the lugs 34 of the steel cap serve by their engagement with the iange 33 to prevent the withdrawal of the cap and the lock barrel and that at such times as the mechanism is locked and the key is withdrawn the stronger steel lugs 34 of the sealing cap are in locking engagement VWith said flange 33. At such times as the mechanism is unlockedwith the key in place there will be no occasion for tampering with the lock and the engagement of the die cast lugs-35 of the lock barrel with the flange 33 w' lbe ade uate protection against the withdrawal .oft e parts.

The lock structure controlled by the turning movements of the lock barrel may be `of any type, but, as shown, a cam or wrist-pinv 38 projecting from the lower end of the lock barrel 16 engages a groove in a springpressed locking bolt 39 slidably mounted in the lock-case and serves by its engagement in a housing, not shown, to prevent longitudinal movement of the lock-'case which forms the head ofa locking bar 40 for locking the mechanism, such as the gear shift of an automobile.

With this construction the soft s'teel sealing cap not only retains the lock barrel in the lockcase, but protects it from` being tam ered with and should an attempt be ma e to force it to a position for removal, such attempt will be effectively prevented by the engagement of the lugs 34 thereof with the locking lugs 35 that block the slots Z0. Any attempt at driving the sealing cap further would cause the rupture of the die cast lock barrel in the plane of one of the tumbler -slides and so prevent access to the locked mechanism.

The vertical slot 41 in the side of the lockcase 15 is to receive a set-screw from the housing in which said lock-case is slidably mounted to prevent the lock-case from turn- Viththis lock the lock barrel is assembled in the lock-case from the front, making it inex ensive to manufacture, and is protected by t e sealing cap which holds it in place, the Wear and resistanceto tam ering being ma ing the lock strong an durable and e cient for the purposes intended. The present lock is designed particularly for locking the gear shift mechanism of automobiles but `is not conined thereto and is capable of general use.

What I claim is new and desire to secure by Letters Patent is:

1. In a lock, a lock-case having a b ore through its front end, a lock barrel itting in the bore, a flange in the bore having openings forming slots, locking lugs on the lock barrel entered through theslots and engaging the flange, and a cap fitting on the end 'of the lock barrel and havlng projecting locking lugs also entered through the slots and engaging the flange.

2. In a lock, a lock-case having a bore, a iiange within the bore provided with openings .forming slots, a die cast lock barrel fitting within the bore and having proJect-y ing lugs entering through the slots and engaging beneath the flange, and a soft steel cap tting on the end of the lock barrel and having projecting lugs also entering through the slots and enga ing beneath the flange.

3. In a lock, a loc -case having a. bore and a counterbore, an annular fia-nge within the counterbore, there being opposite slots Jformed in the walls of the bore and passing through `the ange, a lock barrel fitting in the bore and having lugs fitting in the counterbore beneath the ange, and a cap fitting on the end of the lock barrel and having opposite lugs also fitting in then counterbore beneath the flange.

4. In a lock, a lock-caseI having a bore opening to its front end and having a counterbore at its front end, a flange within the counterbore, there being slots in the walls of the bore and extending through the iiange,.

a lock barrel fitting in the bore and having tumblers engaging the slots, opposite lugs formed on the lock barrel and entered throughA the slots into the counterbore beneath the Bange, a cap fitting on the end of the lock barrel and contained Within the counterbore and fitting between the lock barrel and the flange, and lugs on the ca also entered through the slots and engage beneath the flange.

5. In a lock, a lock-case havin av bore opening to the front end thereo with a counterbore at the front end, an annular flange within the counterbore spaced from"` the end of the bore, there being an annular groove in the walls of the bore spaced from, the counterbore and longitudinal broached 'in the walls of the Jbore and f, through the ange to the said groove, a lock barrel fitting in the bore--and having tumblers to engage with the slots, opposite lugs formed on (the lock barrel and entered through 'the slots to the counterbore beneath the Y nge, a ca. fitting on the end of the lock arrel and etween the lock barrel and the lflange and Ahaving opposite lugs also entered through the slots and engaging in the counterbore beneath the ange, a cam projection on the other end of the lock barrel, and a springressed locking bolt slid'- ably mounted in t e lock-case and engaged 1 by the cam projection.fff 3 k6. ,In a lock, a lock-case having a bore through its front end, a lock barrel fitting in the here, a iange in the bore having openings frorning slots, locking lugs on the lock barrel entered through the slots and engag-l ing the flange, and a cap fitting on the end of the lock barrel and having projecting locking lugs also entered through the slots and engaging the flange and .having an annular shoulder'overl ing the liange.

^ 7. In a lock, a loc -oase having a bore, a flange Within the bore provided with openings forming slots, a die cast lock barrel fitting Within the bore and having project-- ing lugs entering through the slots and engaging beneath the flange, and a lsoft steel cap fitting on the end of the lock barrel and having projecting lugs also entering through the slots and engaging beneath the ange and also having a projecting shoulder overlying the ange. Y

8. In a lock, a lock-case having a bore and a counterbore, an annular flange Within the counterbore, there being opposite slots formed in the Walls of the bore 'and passing through the flange, alock barrel fitting in the bore and having lugs fitting in the counter-bore beneath the flange, and a cap fitting on the end of the lock Ibarrel `and having opposite lugs also fitting in the counterbore beneath the flange. and also having an annular flange or shoulder fitting Within lthe counter-borel and overlying the flange to protect it and conceal the slots.

In testlmony whereof, I allx my signature.

EDWARD N. Jacor. 

